Senior Prompt Engineer

We are seeking an expert Senior Prompt Engineer to design, optimize, and operationalize the LLM architectures powering BOLD’s consumer-facing career tools. In this role, you will bridge the gap between advanced natural language processing and exceptional user experiences, ensuring our generative AI outputs are safe, hyper-personalized, contextually accurate, and highly reliable. You are a technical specialist who understands model behavioral nuances, token optimization, latency trade-offs, and system-level prompt chaining. You thrive in an environment balancing rapid prototyping with rigorous, data-driven engineering.   ABOUT THIS TEAM As a Senior Prompt Engineer, you will sit at the intersection of technical prompt design, rapid prototyping, and rigorous, data-driven evaluation. You will work closely with LLM/Machine Learning Engineers, Product Managers, and UX Designers, acting as the technical specialist who translates product requirements into safe, reliable, production-ready prompt systems.   WHAT YOU’LL DO - Design, prototype, and iterate complex system prompts, few-shot exemplars, and chain-of-thought structures for consumer AI experiences, including Resume Adaptation, Personalization, and Real-time Feedback. - Partner with LLM/Machine Learning Engineers, Product Managers, and UX Designers to translate product requirements into technical prompt specifications, optimizing for latency and API costs. - Architect evaluation frameworks - automated, heuristic, and human-in-the-loop - to benchmark, test, and guardrail LLM outputs against hallucination, bias, and tone drift. - Develop standardized prompt frameworks, version-control workflows, and operational playbooks to help distributed product teams leverage AI safely and efficiently. - Monitor the evolving GenAI landscape - OSS models, new architectures, and prompt techniques - to continuously improve product performance and model throughput.   WHAT YOU’LL NEED - 5+ years of professional experience working closely with language technologies, computational linguistics, or software product development. - 2+ years of hands-on experience shipping LLM-backed features to production for consumer applications, spanning the full prompt development lifecycle and automated evaluation (eval) prompts. - Mastery of advanced prompt engineering techniques: few-shot, chain-of-thought, ReAct, and prompt chaining. - Deep familiarity with LLM evaluation tools and frameworks such as RAGAS, LangSmith, TruLens, or custom heuristic testing. - Proven ability to manage complex prompt deployment pipelines in a fast-paced, continuous integration environment.

- Fluent English (C1): Strong written and verbal communication skills are a must, as you will work in a global environment. - Collaborating with global teams, requiring periodic availability in the late afternoon (up to 7:00 PM Polish time).   WHAT’S GOOD TO HAVE - Experience with resume builder products, HR tech, or career content platforms. - Familiarity with fine-tuning, RLHF, or preference data collection workflows. - Experience with structured output validation (JSON Schema, Pydantic, or equivalent). - Familiarity with orchestration tooling: LangChain, LlamaIndex, LangSmith, PromptLayer, or equivalents. - Contributions to open-source prompt design projects or published writing on the topic.   HERE’S A FEW OF OUR PERKS & BENEFITS - Salary range: 16 000 - 18 000 PLN gross (Employment agreement / Umowa o Pracę) - Private healthcare (Medicover, medical-only or medical with dental care individual package, 100% paid by BOLD). - Mental health support and resources. - Multisport Plus card (individual package, 100% paid by BOLD). - Udemy Business access. - 100% remote work (You must live in Poland or be willing to relocate to Poland to be considered for this role. ). - Flexible work hours (Each team has their own working habits and obligatory meetings. ). - Workation (up to 10 working days a year within EEA).